Abstract
The results of investigations on the suitability of using volcanic scoria (VS) as coarse aggregate in lightweight concrete production are reported. Tests were conducted on concrete by replacing 0–100% of coarse crushed gravel aggregate by volume. The physical properties of volcanic scoria were critically reviewed to evaluate the possible influence on both the fresh and hardened state of concrete. The properties of VS concrete using different percentages of VS aggregate were evaluated by conducting a comprehensive series of tests on workability, strength, drying shrinkage, surface absorption and water permeability. It is concluded that the VS concrete has sufficient strength and adequate density to be accepted as structural lightweight concrete. However, compared with the control concrete, the VS concrete has a lower modulus of elasticity, and higher permeability and initial surface absorption.
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